I just super glued a bunch of baby java ferns to a rock. Its a very porous rock (cement actually) I figured the plant would have no problem attaching itself to that. I did my research and superglue is supposed to be safe for aquarium use... But can I put it in immediately? How long does it take to completely cure? I dont want it leeching anything into my water. What about cement? Its an old chunk I found in my backyard from when we knocked down a wall a few years ago. I completely forgot to check whether it would be good or bad... Right now I have it set aside in a cup of water: